(Roman Catholic Church) someone who proposes or pleads for a candidate for beatification or canonizationsomeone who assumes or takes something for granted as the basis of an argument
英汉双解大词典
postulator/ˈpɒstjʊˌleɪtə/
1.
N(名词)
a person, usually a priest, deputed to prepare and present a plea for the beatification or canonization of some deceased person 宣福人; 通常为牧师,为死者宣福 [RC Church]